test: city temperature

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    svg {
      width:100%;
      height:100%;
    }
  </style>
</head>

<body>
  <svg></svg>
  <script>
		var city = 'San Francisco';
  	var width = 800;
    var height = 300;
    var margin = {top: 20, bottom: 20, left: 20, right: 20};
    
    d3.tsv('data.tsv', (err, data) => {
      data.forEach(d=> {
        d.date = d3.timeParse("%Y%m%d")(d.date);
        d.date = new Date(d.date);
        
        ++d[city];
      });
			
	    var xExtent = d3.extent(data, d => d.date);      
      var xScale = d3.scaleTime()
      	.domain(xExtent)
      	.range([margin.left, width - margin.right]);
     
      var yExtent = d3.extent(data, d => d[city]);
      var yScale = d3.scaleLinear()
      	.domain(yExtent)
      	.range([height - margin.bottom, margin.top]);
      
      var heightScale = d3.scaleLinear()
      	.domain(yExtent)
      	.range([0, height - margin.top - margin.bottom]);
           
      var svg = d3.select('svg');
      var rect = svg.selectAll('rect')
      	.data(data)
      	.enter()
      	.append('rect')
      	.attr('x', (d) => xScale(d.date))
      	.attr('y', (d) => yScale(d[city]))
      	.attr('width', 2)
      	.attr('height', (d) => heightScale(d[city]))
      	.attr('fill', 'blue')
      	.attr('stroke', '#fff');
      
      var yAxis = d3.axisLeft()
      	.scale(yScale);
      
      var xAxis = d3.axisBottom()
      	.scale(xScale)
      	.tickFormat(d3.timeFormat('%b %Y'));
      
      svg.append('g')
      	.attr('transform', 'translate(' + [margin.left, 0] +')')
      	.call(yAxis);
      
      svg.append('g')
      	.attr('transform', 'translate(' + [0, height - margin.bottom] +')')
      	.call(xAxis);
    });
    
  </script>
</body>

https://d3js.org/d3.v4.min.js